Shoe-bottom filler and process of making the same.



U TED sTArns PATENT oFFIon- ANDREW THOMA, 0F CAMBRIDGE, MASSACHUSETTS, A SSIGNOR TO NORTH AMERICAN I CHEMICAL COMPANY, OF NEW YORK, N; Y., A CORRORATION OF MAINE.

SHOE-BOTTOM FILLER AND PROCESS OF MAKING THE SAME.

Specification of Letters Patent.

Patented Oct. 31, 1916.

No Drawing. Original application filed May 11, 1908, Serial No. 432,033. Divided and this application filed March 26, 1912. Serial No. 687,292. 1

To all whom it may concern:

Be it known that I, ANDREW THOMA', a citizen of the United States, and resident of Cambridge, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Shoe-Bottom Fillers and Processes of Making the Same, of which the following description is a specification.

My present invention relates to a shoebottom filler, being a division of the parent application Serial No. 432,083, filed May 11, 1908, now Patent No. 1,032,312, dated July 9,1912, which is in part, a derivative from my- Patent No. 832,002, Sept. 25, 1906, (as is clear from the references to the latter found at page 1, lines 14-32, -53, 57, 67, page 2, lines 30410, 56, 63-71, and elsewhere, as page 5 beginning at line 27, in

No. 1,032,312, which set forth the connection of the later patent with its predecessor The broad or generic IIH'GIP" No. 832,002). tion ofmy'said application, consists of a shoe-bottom filler having a waxy, gummy or pitchy base ;combined with a restraining agent of a pasty nature, mixed with the required amount of connninuted body filler material, the proportions being such that the compound is firm under practicable conditions of temperature in use, elastic, and sleek under a smoothing iron or daubing tool when applied to the shoe or leather. The said base, it. is stated, may comprise a wide range of ingredients, as moreparticularly enumerated in certain of my patents there mentioned, while the restraining agents may comprise pastes of vegcta ordinary starch, dcxtrin, gluten -or gum arabic, or of animal origin such as' glue, casein, albumen, or of mineral origin such as the soluble silicates or silicic acid. My parent application (now Patent No. 1,032,312 above) explains both thc thcory and practice of the invention in its broader aspects, in connection with a wide variety of species and processes, and contains the broad or generic claims to coverallthese species and processes, and, the specific claims of that species which cn'iploys starch paste. and waxtailings.

The present divisional application relates primarily to the combination of such rc- .resin derived ble origin, such as straining agents, and more particularly percha or other vegetable gums, including balata, Pontianak, almadeina, chicle, tuna.

In the present application, particular prominence is given to Pontlanak and to disintegrated, or decomposed so as to produce or derive said resin, and all these fea- F iom said Pontianak and to a'f direct boiling process by which the gum is tin-es are specifically claimed. but the specifij cation is written primarily from the stand point of its broadest claim, claim 1, which is not limited in these specific respects. In order to define the position of tl1is. a1 )plication with relation to the parent caseandthe various other divisional cases and to make. clear the scope ot this case, I point out that this broadest claim (from which stand-v point the specification is primarily written);

includes the paste-making mgredientasits principal or specific limitation, combined with, broadly. any kind of a resinous gum;

and any kind of a softeningoil, and hence? includes gutta pcrcha. for instance, hether. of a high grade or of a low grade, and no,

matter howti'eated. n' the other hand, thefI- remaining claims contain as their principal or specific limitations. the resin derived from a gum, and certain of them refer to a spes cilic gum.

formula of gutta percha considered as:

type, and whether treated one way or an (lcrtain of said claims also con- 1am the additional specific limitation of other, and whether thc formula is subject or not. to the other specific limitations. it 111-.

eludes the narrow and more spccilicformula of a resin derivative from Iontianak gum and dextrin. and the specific processes. (laim 2 stands herein as the result'o't' an in.

icrli-rencc with the patent ol? .lamcs l.

Keener N0. 1.019.002 ot' .\larchl2, 1012.

Preferably I first refer to the leading formula. or disclosure of ingredients first BEST AVAILABLE COP.

sists of a mixture of five parts of gutta percha to three parts of rosin and two parts of a solvent or softening oil like paraiiin-oil; and in which it is stated that instead of the gutta percha I may use other vegetable gums, such as-balata, Pontianak. and the others above mentioned, or low-grade rubbers may also be mixed in to some extent. I use the word rosiir as synonomouswith "resin in the formula of my patent just mentioned, to designate the specific articleknown also as colophony and which is freuently designated as resin" and more properly as rosin. As the quality of vegetable gums is often unstable, the amount of oil is varied so as to give satisfactory results, and this softening oil may be of mineral or vegetable origin and thick or thin, the quantity used depending upon its body or quality. The mass or at least the gum, Pontianak being herein given preference is then subjected to a melting heat until the vegetable gum. Pontianak for example, is disintegrated, which converts it into a resin derivative. so that it becomes. for the purposes of the binder. a resin, and in proper condition to unite with .the other resinous part, the oil helping assimilate the two and giving a temper or smoothness and pliability to the compound, which is fluid while hot The paste or paste-making ingredients, of starch or dextrin, for example, as alreadv enumerated dextrin being herein given preference, may be mixed into the filler as a powder, solution, or in the form of ordinary wet paste, and may be introduced before the cork and binder are mixed or as they are being mixed or afterward, all as explained in my parent ap lication and which need not therefore be ere repeated in detail. The proportionate amount of the pasteforming material used varies accordm to the nature of the rest of the compound and of the granulated body-material. The following formulae are given as practical and illustrative: granulated cork 6 parts by weight, coarse flour 1 part-s by weight, and the gummy binding material 11 parts by weight; or, granulated cork 8 parts by weight, dextrin 1 parts by weight,

- and the gummy binding material 14 parts by weight. 7

The filler maybe used hot or cold, and if hot will not cling to the spatula or dauber in being applied to the shoe-bottom. I have urposelylomitted from this s ecification, in order to avoid making it pro ix, most of the explanation of the use and advantages as it is fully elaborated in the parent case of which this is a-division,

I this division being restricted in its description' and claims to one of the branches or species of the invention which, although 1ncluded in the broad, generic claims of said parent case, could not be therein claimed specifically because an alternative species is therein claimed.

My principal object is to make a filler which combines the hardening and toughening principle with the waxy or gummy, sticky, heat-sensitive character of my previous fillers, so that the resultant product is permanently pliable and tough but not liable to soften under the moderate heat .0 which it is subject in use, when once heated, installed, and set. \Vhen installed in a shoe, it sets at once so that the shoe can pass on almost immediately to the next step in its manufacture and yet it still retains'and maintains the permanent pliability, elasticity, etc., substantiallv permanent and unchanged for an indefinite period extending beyond the natural life of the shoe.

Besides my principal object, asabove stated, my invention includes subordinate or less prominent features, as more definitely pointed out'in certain of the Slll'DOltlll'lfltt' claims.

I do notrestrict my invention to requiring the filler to be applied hot, as the same ingredients as above set forth, may be. used cold.

My 00- )ending application. Serial No. 707,017, filed July 1, 1912, and now Patent No. 1,115,988, dated .\'ov. 3, 191-1, (which is also a divisional case of the same parent application as the present) contains broad claims which are generic to both the dextrin species of that application and of this application, and hence the claimsherein contained are otherwise limited.

I am led to )refer Pontianak, 0r gutta Jelutong, dead orneo, or besk, (which resembles a low grade gutta percha and is sometimes so called), first, because,'of its abundance and cheapness, and, second, because of its extreme stickiness (when treated as above set forth), and special adaptability to the peculiar requirements of shoe-bottom filler. Ordinary commercial Pontianak consists essentially of resins, containing a small "percentage of a rubber h dro-carbon and from 75% to 90% resins. prefer to derive the resin by the boiling rocess above instead of employing the rest ual Pontianak resin of commerce, because by my process the product seems to have asbetter consistency and more toughness adaptable to shoe fillers.

This product of the boiling process is solu-.

ble in acetone, and, therefore, viewed from the standpoint of rubber technology, is a resin and no longer a gum, the word resin being understood to cover bodies soluble in acetone (whether saponifiable or not) and to cover also bodies feebly soluble in acetone -but soluble in .dichlorhydrin, a' certain amount of depolymerized rubber sometimes occurring in actual practice in the acetone extract. In the original gum or Pontianak,

BEST'AVAILABLE cow the high percentage of'resinous matter is merely held present as a part of the gum by an exceedingly small percentage of softening properties or gummy properties in a fibrous cell structure, which is broken down and destroyed by the disintegrating heat or decomposition, which drives oii the volaitile constituents and leaves the resin. The amount and duration of heatrequired are simply enough .;;comp1ete1 to disintegrate.

the gum, or deeompose it to the extent of destroying or'breakmg down said cell structure or fiber, which becomes modified or ab sorbed or lost alto ether, according to the particular ,grade the gum, i. 'e., accordmg to the proportion of resin contained in its composition, but not to the extent of decomposing the gum into its ultimate gaseous andcoke parts, which, of course, would not be sticky and would not serve my purpose.

Itis not practicable to state any fixed temperature or len th of time, because this gum,

'findiinfact al the vegetable gums mentioned, including the usual low grades of gutta percha, vary in qualityon the market,

f ,and-fsomeot them, particularly Pontianak,

ra'pidl 01xidize and deteriorate, but one invthe art will have no difficulty in determining the amount and duration of heat 'neces'sary,according to the special condition .of'the gum at" any given time. The

seethin' or boiling point is readily determined' ypbservin the tendency toward ebulitiom'and the ascribed point of disintegmtion or decomposition is reached when all *stringiness and tendency to stringiness I have disappeared and the liquidhas become ""thinand smootli'like water, so that there can'be no return the gummy state or form Having described my invention, what I resinous vegetable gum, and an oil solvent until said gum is disintegrated into a resin derivative, and thoroughly mixing with said solution a paste-making ingredient which, when the com ound is cold, will maintain the same sti for a shoe-bottom filler and permanently pliable but non heat- .influenced under ordinary temperature conditions of use.

4. The herein described process, consisting of applying a melting heat to rosin, Pontiana and an oil solvent until said Pontianak is disintegrated into a resin derivative, and thoroughly mixing dextrin therewith to a consistency maintaining the compound, when cold, stifi' for a shoe-bottom filler and permanently pliable but non heat-influenced under ordinary'temperature conditions of use.

In, testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ANDREW THO Witnesses:

Gno. H. MAXWELL, JAMES R. HODDER. 

